Fluid cooled roll



Patented Feb. 9, 1932 Umrsn s ra'r fsrs rarer-air iorrics JOHN H. FOX, OF PITTSBURGH, PENNSYLVANIA, ASSIG-NOR TO PITTSBURGH IfIiATE GLASS'COMPANY, A CORPORATION OF PENNSYLVANIA FLUID, COOLED ROLL Application filed May 2?, 193b, Serial No. 456,233.

The invention relates to fluid cooled rolls for use in glass rolling apparatus. Themvention has for its principal object the provision of a roll in which the tendency to warp under the severe heat condition encountered in forming glass sheets in an intermittent rolling operation is reduced to a minimum,

, construction of Fig. 1. Fig. 8 is a partial longitudinal section through the roll. VAnd Fig. i is a partial longitudinal section through a modified form of roll.

Figure 1 illustrates the application of the roll to an intermittent rolling apparatus, the glass sheet 1 being formed between the rolls 2 and 3, the latter being the structure to which the present invention is directed. The rolls are suitably driven, the roll 2 being supported upon the driven drive rolls 4 and 5. The

body of glass 6 which forms the sheet is teemed into a pocket between the two rolls. One of the difficulties encountered in a rollingoperation of this kind is that of maintaining the roll 3 at a proper temperature to prevent warping due to the fact that the application of the large body of molten glass on one side of the roll tends to distortit. As a result, the roll bows to a certain extent and the glass sheet which is formed is of uneven thickness. As a result the sheet must be cast somewhat thicker than would otherwise be the case and more grinding 1s reopened in order to bring the two faces of the sheet into paral-V 1? lelism throughout.

The present invention is designed to overcome this difficulty to a large extent and reduce any bowing or warping of the roll to a minimum.

The roll preferably consists of the hollow supporting cylinder or casing 7 through which a circulation of water is provided by means of the swivels 8, 8 provided with the water supply connection 9, 9. The end of the cylinder 7 is also provided with a connection to the tumbler shaft 10 for driving the roll.

The'supporting cylinder or casing 7 is provided with a jacket made up ofa plurality ofv rings 11, 11, 11, etc. These rings are shrunk onto the cylinder 7 and are provided with shoulders,-'as indicated at 12 (Fig. 3), so that'when the rings are in engagement, the slots 13 are provided between the adjacent faces of the rings. The size of these slots is much exaggerated as shown in'Fig. 3 for the purpose ofillustration and in actual construction would be about one-hundredth of an inch in width so that the molten glass will not penetrate into the slots. By this arrangementany warping due to the roll being overheated on one side is reduced to a minimum since each ring canexpand longitudinally of thefroll without affecting the other rings. Any other suitable means might be employed for spacing the rings apart the necessary distance, but the shoulders12 seem to be the best means for accomplishing thisresult.

Inorder that the expansion of the rings 11 under the action of the hot glass shall not causethern to loosen on the cylinder 7 the rings are made of a material having a lower coefiicient of expansionthan thecylinder 7, A wide variety of materialsmay be employed for giving this diiferene in expansion. The cylinder 7 ispreferably made of a steel alloy known as resistal which on analysis shows iron 65. per cent, chromium 5.5 per cent, nickel 22 per cent, silicon 1.25 per cent, and carbon .5'per cent. This alloy has a coefficient ofexpansion' of .0000159. The rings 11 are preferably of steel, which has a coefficient of expansion of .000011. With this combination-of materials, the rings will not loosen in serviceupon the cylinder under operating conditions, such as are present in a casting operation with an apparatus of the form illustrated.

I Fig. 4 illustrates a-modification in which i cylinder 7 being ofsthe alloyhaving a higher coefiicient of expansion than that 'of' the sleeve. The sleeve is sawed at intervals to provide the slots 15 to take the place of the slots 13 of the construction of Figs. 1 to 3.

If the rings or sleeve are not secured on the cylinder by shrinking, they must be secured by brazing, and this is preferably done by the use of copper as a brazing material in a hydrogen furnace. If a brazing method is employed, the material of the sleeve or rings may be of the same coefiicient of expansion and the copper union will be of sutficient strength to prevent the loosening of the rings under the temperature conditions encountered in the use of a, roll of this kind. Any tendency to loosen With a brazed joint may also be reduced by shrinking the sleeve on, or by having the sleeve of a material with a lower coeflicient than the material of the cylinder, although these expedients arenot essential if a properly brazed-joint is secured. The copper may be applied in the form of a thin sleeve lying between the parts to be joined, or by plating the surfaces to be joinedwith copper preliminary to bringing them to the temperature necessary for brazing in the hydrogen furnace. "What I claim is:

1. In combination in a roll, an inner supporting cylinder, means for circulating a cooling fluidthrough the cylinder, and a jacket secured on the cylinder and subdivided by a plurality of parallelslots extending inward from the surface of the jacket, said jacket being of a metal having a lower ooethcient of expansion than the metal of the cylinder so that the jacket Will'not become loose when heated to a higher tempera ture thanthe cylinder.

2. In combination in a roll, aninner sup-v porting cylinder, means for circulating a cooling fiuid through the cylinder, and a jacket secured on the cylinder and made up of a plurality of rings spaced apart a slight distance at their opposing side edges, said rings being of a metal having .a lower coefiicient of expansion than the metal of the cylinder. V i

In combination in a roll, an inner supporting cylinder. means for circulating a cooling fluid through the cylinder, and a jacket secured on the cylinder and made up the metal of the cylinder so that the rings will not become loose when heated to a higher temperature than the cylinder.

5. A roll comprising a cylinder and a jacket secured thereto formed of a series of rings provided with radially extending slots.

6. A roll comprising a cylinder and a jacket formed of a plurality of rings provided with radially extending slots, said rings beoia plurality of rings contacting with each I A other attheir inner edges, but spaced apart slightly from such points of contact to their peripheries for expansion, said rings being of a metal having a lower coeificient of expansion than the metal of the cylinder. I

. 4. In'combination in a roll, an inner sup porting cylinder, means for circulating a- -cooling fluid through the cylinder, and a jacket secured on the cylinder and made up of a plurality of rings placed end to end having their opposing ends closely adjacent, but out of contact, said rings being of a metal having a lower coefiicient of-expansion than 9 

